target/linux/bcm27xx/patches-6.1/950-0671-usb-xhci-drop-and-add-the-endpoint-context-in-xhci_f.patch

   1 From 0103035be2b28a8dbb5ccc207c61043d5eb1bc18 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.com>
   3 Date: Fri, 10 Mar 2023 14:21:42 +0000
   4 Subject: [PATCH] usb: xhci: drop and add the endpoint context in
   5  xhci_fixup_endpoint()
   6
   7 Setting both the Drop and Add bits on the input context prevents the
   8 corruption of split transactions seen with the BCM2711 XHCI controller,
   9 which is a dwc3 variant.
  10
  11 This is a downstream feature that allows usbhid to restrict polling
  12 intervals on mice and keyboards, and was only tested on a VL805 which
  13 didn't complain about the fact the endpoint got added twice.
  14
  15 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
  16 ---
  17  drivers/usb/host/xhci.c | 2 +-
  18  1 file changed, 1 insertion(+), 1 deletion(-)
  19
  20 --- a/drivers/usb/host/xhci.c
  21 +++ b/drivers/usb/host/xhci.c
  22 @@ -1732,7 +1732,7 @@ static void xhci_fixup_endpoint(struct u
  23                 return;
  24         }
  25         ctrl_ctx->add_flags = xhci_get_endpoint_flag_from_index(ep_index);
  26 -       ctrl_ctx->drop_flags = 0;
  27 +       ctrl_ctx->drop_flags = ctrl_ctx->add_flags;
  28
  29         spin_unlock_irqrestore(&xhci->lock, flags);
  30